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The Single UNIX &reg; Specification, Version 2<br>
Copyright &copy; 1997 The Open Group

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<h4><a name = "tag_000_007_1936">&nbsp;</a>NAME</h4><blockquote>
realpath - resolve a pathname
</blockquote><h4><a name = "tag_000_007_1937">&nbsp;</a>SYNOPSIS</h4><blockquote>
<pre><code>

#include &lt;<a href="stdlib.h.html">stdlib.h</a>&gt;

char *realpath(const char *<i>file_name</i>, char *<i>resolved_name</i>);
</code>
</pre>
</blockquote><h4><a name = "tag_000_007_1938">&nbsp;</a>DESCRIPTION</h4><blockquote>
The
<i>realpath()</i>
function derives, from the pathname pointed to by
<i>file_name</i>,
an absolute pathname that names the same file, whose resolution does not
involve ".", "..", or symbolic links.  The generated pathname is stored, up to
a maximum of {PATH_MAX} bytes, in the buffer pointed to by
<i>resolved_name</i>.
</blockquote><h4><a name = "tag_000_007_1939">&nbsp;</a>RETURN VALUE</h4><blockquote>
On successful completion,
<i>realpath()</i>
returns a pointer to the resolved name.  Otherwise,
<i>realpath()</i>
returns a null pointer and sets <i>errno</i> to indicate the error, and the
contents of the buffer pointed to by <i>resolved_name</i> are undefined.
</blockquote><h4><a name = "tag_000_007_1940">&nbsp;</a>ERRORS</h4><blockquote>
The
<i>realpath()</i>
function will fail if:
<dl compact>

<dt>[EACCES]<dd>
Read or search permission was denied for a component of
<i>file_name</i>.

<dt>[EINVAL]<dd>
Either the <i>file_name</i> or <i>resolved_name</i> argument is a null pointer.

<dt>[EIO]<dd>
An error occurred while reading from the file system.

<dt>[ELOOP]<dd>
Too many symbolic links were encountered in resolving <i>path</i>.

<dt>[ENAMETOOLONG]<dd>

The <i>file_name</i> argument is longer than {PATH_MAX} or
a pathname component is longer than {NAME_MAX}.

<dt>[ENOENT]<dd>
A component of <i>file_name</i> does not name an existing file
or <i>file_name</i> points to an empty string.

<dt>[ENOTDIR]<dd>
A component of the path prefix is not a directory.

</dl>
<p>
The
<i>realpath()</i>
function may fail if:
<dl compact>

<dt>[ENAMETOOLONG]<dd>

Pathname resolution of a symbolic link produced an intermediate result whose
length exceeds {PATH_MAX}.

<dt>[ENOMEM]<dd>
Insufficient storage space is available.

</dl>
</blockquote><h4><a name = "tag_000_007_1941">&nbsp;</a>EXAMPLES</h4><blockquote>
None.
</blockquote><h4><a name = "tag_000_007_1942">&nbsp;</a>APPLICATION USAGE</h4><blockquote>
None.
</blockquote><h4><a name = "tag_000_007_1943">&nbsp;</a>FUTURE DIRECTIONS</h4><blockquote>
None.
</blockquote><h4><a name = "tag_000_007_1944">&nbsp;</a>SEE ALSO</h4><blockquote>
<i><a href="getcwd.html">getcwd()</a></i>,
<i><a href="sysconf.html">sysconf()</a></i>,
<i><a href="stdlib.h.html">&lt;stdlib.h&gt;</a></i>.
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UNIX &reg; is a registered Trademark of The Open Group.<br>
Copyright &copy; 1997 The Open Group
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